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2. A string 2.0 m long and fixed at its ends is driven by a 240 Hz
vibrator. The string vibrates in its third harmonic mode. The
speed of the wave and its fundamental frequency is
(a) 180 m/s, 80 Hz
(c) 320 m/s, 120 Hz
(Main 2019, 9 April II)
(b) 320 m/s, 80 Hz
(d) 180 m/s, 120 Hz

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